Inherit EventTarget interface instead of duplicating its code

Source/modules/indexeddb/IDBDatabase.idl

 /*
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  * Copyright (C) 2011 Apple Inc. All rights reserved.
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 [
-    ActiveDOMObject,
-    EventTarget
-] interface IDBDatabase {
+    ActiveDOMObject
+] interface IDBDatabase : EventTarget {
     readonly attribute DOMString name;
     readonly attribute IDBAny version;
     readonly attribute DOMStringList objectStoreNames;
 
     attribute EventListener onabort;
     attribute EventListener onerror;
     attribute EventListener onversionchange;
 
     [RaisesException] IDBObjectStore createObjectStore(DOMString name, optional Dictionary options);
     [RaisesException] void deleteObjectStore(DOMString name);
     [CallWith=ScriptExecutionContext, RaisesException] IDBTransaction transaction(DOMStringList storeNames, [Default=NullString] optional DOMString mode);
     [CallWith=ScriptExecutionContext, RaisesException] IDBTransaction transaction(sequence<DOMString> storeNames, [Default=NullString] optional DOMString mode);
     [CallWith=ScriptExecutionContext, RaisesException] IDBTransaction transaction(DOMString storeName, [Default=NullString] optional DOMString mode);
 
     void close();
-
-    // EventTarget interface
-    void addEventListener(DOMString type,
-                          EventListener listener,
-                          optional boolean useCapture);
-    void removeEventListener(DOMString type,
-                             EventListener listener,
-                             optional boolean useCapture);
-    [RaisesException] boolean dispatchEvent(Event evt);
 };